使用cancan获取未定义的局部变量或方法`roles' [英] using cancan getting undefined local variable or method `roles'

问题描述

我已经放弃了试图锁定应用程序中的每个动作。目前，我正在每个控制器中进行设置/注册：

  load_and_authorize_resource 
 用户模型中的

  def role？ （角色）
 roles.include？ role.to_s 
 end 
  

在能力模型中：

 如果user.role？ ：superadmin 
可以：管理，：全部
结束
  

但是，我得到以下错误：

 未定义的局部变量或方法`roles'
 app / models / user.rb：33 ：在`角色'
 app / models / ability.rb：7：在'initialize'
  

感谢您的帮助。

更新：由于下面的Bohdan的回答，我进一步了解文档，发现有不同的方法来设置cancan模型）。目前我们有6个不同的角色，导致数据库中有6个不同的布尔字段。我正在考虑一种层次化的方法来定义角色，其中一个用户可以拥有许多角色，一个角色有许多用户。有两种方法来设置角色定义。 第一个。 第二个。为了方便使用，我想我会详细定义每个角色，所以每个人只有一个角色。想知道这些的缺点是什么。

更新：除了上面定义的superadmin之外，我已经注释掉了所有其他角色。意识到它与许多问题无关。那么...？

解决方案

你应该有 has_and_belongs_to_many：roles 您的模型或方法角色的任何其他自定义定义

修改

在您将 has_and_belongs_to_many：roles 添加到您的用户模型中以使所有内容您需要的工作

定义新模型称为角色至少包含名称属性

更改

  def role？（role） 
 roles.include？ role.to_s 
 end 
  

to

$角色扮演角色扮演角色扮演角色扮演角色扮演角色扮演角色扮演角色扮演角色扮演角色扮演角色扮演角色扮演角色扮演角色扮演角色扮演角色role.to_s
end

修改

迁移

 类CreateRolesUsers< ActiveRecord :: Migration 
 def self.up 
 create_table：roles_users do | t | 
 t.integer：user_id 
 t.integer：role_id 
 end 
 end 
 
 def self.down 
 drop_table：roles_users 
 end 
 end 
  

只需添加此迁移并运行 rake db ：迁移 rails将执行其他操作

I've given up on trying to lock down every action in the application. Currently I'm placing in every controller except the devise/registration:

load_and_authorize_resource

in the user model:

  def role?(role)
    roles.include? role.to_s
  end

in the ability model:

if user.role? :superadmin
  can :manage, :all
end

However, I am getting the following error:

undefined local variable or method `roles'
app/models/user.rb:33:in `role?'
app/models/ability.rb:7:in `initialize'

Thanks for your help.

UPDATE: Because of Bohdan's answer below i looked further into the documentation and found there are differing methods of setting up the cancan model(s). currently we have 6 different roles resulting in 6 different Boolean fields in the database. I was thinking of a hierarchical approach to defining roles where one user could have many roles and one role has many users. There are two ways to set up the role definitions. First. Second. For ease of use i think i'll define each role exhaustively so there is only one role for each person. Wondering what the disadvantages of that are.

UPDATE: I commented out all the other roles other than superadmin as defined above. Realized that it doesn't have anything to do with many to many issue. So...?

解决方案

You should have has_and_belongs_to_many :roles in your model or any other custom definition for method roles

Edit

after you added has_and_belongs_to_many :roles to your User model to make everything work you need

define new model called Role with at least name attribute

change

def role?(role)
  roles.include? role.to_s
end

to

def role?(role)
  roles.map(&:name).include? role.to_s
end

Edit

migration

class CreateRolesUsers < ActiveRecord::Migration
  def self.up
    create_table :roles_users do |t|
      t.integer :user_id
      t.integer :role_id
    end
  end

  def self.down
    drop_table :roles_users
  end
end

just add this migration and run rake db:migrate rails will do the rest

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